CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
NET SALES	$ 248,913	$ 243,525
COST OF SALES	137,019	139,741
GROSS PROFIT	111,894	103,784
OPERATING EXPENSES:
Selling, general and administrative	81,024	78,808
Research and development	16,274	14,872
Impairment charges	0	3,845
Contingent consideration expense	402	4,897
Total operating expenses	97,700	102,422
INCOME FROM OPERATIONS	14,194	1,362
OTHER INCOME (EXPENSE):
Interest income	472	79
Interest expense	(1,537)	(3,144)
Other expense - net	(435)	(289)
Total other expense - net	(1,500)	(3,354)
INCOME (LOSS) BEFORE INCOME TAXES	12,694	(1,992)
INCOME TAX EXPENSE	1,736	1,162
NET INCOME (LOSS)	$ 10,958	$ (3,154)
EARNINGS (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 0.20	$ (0.06)
Diluted (in dollars per share)	$ 0.19	$ (0.06)
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	55,717	55,246
Diluted (in shares)	56,978	55,246